The Horde Application Framework is a modular, general-purpose Web application framework. It provides an extensive array of classes that are targeted at the common problems and tasks involved in developing modern Web applications.

LimeSurvey (formerly PHPSurveyor) is a Web
application that interacts with MySQL, MSSQL, or
Postgres to develop surveys, publish surveys, and
collect responses to surveys. Once a survey has
been created, data can be inserted into the survey
either by a "pretty" public screen which presents
each question one at a time, or by a quick and
nasty data entry screen. It includes the capacity
to generate individualized "tokens", so that
invitations can be issued to participants. It also
has the capacity to set conditions on whether
questions will display (branching), numerous
question types, and a basic statistics function.

Ingo is an email-filter management application. It
is fully internationalized, integrated with Horde
and the IMP Webmail client, and supports both
server-side (Sieve, procmail, maildrop) and client-side
(IMAP) rule creation.

phpMyAdmin is a tool intended to handle the
administration of MySQL over the Web. It can
create, rename, and drop databases,
create/drop/alter tables, delete/edit/add fields,
execute any SQL statement, manage keys on fields,
create dumps of tables and databases,
export/import CSV data, and administrate one
single database and multiple MySQL servers.

Nag is a Web-based application built upon the Horde Application Framework that provides a simple, clean interface for managing online task lists (i.e. TODO lists). It includes strong integration with the other Horde applications and offers shared task lists.

Mahara is a fully featured electronic portfolio, blog, resume builder, and social networking system for connecting users and creating online communities. It integrates with Moodle and many online services.

Bitcoin is a peer-to-peer electronic cash system that is completely decentralized, without the need for a central server or trusted parties. Users hold the crypto keys to their own money and transact directly with each other, with the help of a P2P network to check for double-spending.

Thunderbird is a total redesign of the
Mozilla mail component to produce a
cross-platform, stand-alone mail application using
the XUL user interface language. It has many new
features, among them the ability to customize
your toolbars the way you want them. a new look
and feel with a large number of downloadable
themes which alter the appearance of the client,
and the ability to add UI extensions.